Maurice lachmabt



M. LACHMAN.-

ROLLED STEEL GRATING. APPLICATION FILED. MAR- 25. 1919.

Patented Dec. 23, 1919.

INVENTOR Wa /re G .L flak/7727f? MAURICE LACIE-IMAM, OF NEW YORK, N. Y.

ROLLED-STEEL GRATJLNG.

Specification 012 Letters Patent. Patented Dec. 23, 1919.

Application filed March 25, 1919. Serial Ito. 285,033.

To all whom it may concern:

Be it known that l[, MAURICE LAGHMAN, a citizen of the United States, and a resident of New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Rolled-Steel Gratings, of which the following is a specification.

My invention relates to metal gratings and methods of manufacturing the same, the object being to produce a metal grating of great strength preferably having a smooth wear or tread surface and that may be cheaply constructed from rolled metal such as steel.

Gratings have heretofore been produced from cast metal and also from pieces of metal assembled or connected together and comprising substantially longitudinal or supporting members and connecting pieces or parts attached between longitudinal members spaced apart to leave openings in the grating.

lfn my improved grating the longitudinal supporting members and cross or connecting members are all of rolled metal and integral with one another, thereby giving great strength and also permitting the manufacture of gratings by methods whereby the gratings may be produced cheaply.

lin the accompanying drawings:

Figure 1 is a plan of a section or blank of rolled metal from which my improved grating may be produced.

Fig. 2 is a cross-section of the same on the line 2-2 Fig. 1.

Fig. 3 is a plan of the finished grating.

Fig. 4 is a cross-section of Fig. 3 inverted and taken on the line 4-4 Fig. 3.

Fig. 5 is a longitudinal section of a tion of a modified form of blank.

Referring to Figs. 1 and 2, 2 indicates the body or web of a rolled metal bar pr'eferably substantially smooth or having a substantially uniform surface upon one side to constitute, as will be hereinafter described, a smooth wear or tread surface for the grating and having longitudinal flanges,

por-

ribs or projections 1 projecting from the other side thereof. Said projections 1 may be of they same or diflerent heights and the intermediate ribs between the edge ribs may be of less height than the edge ribsas will be obvious but some of said ribs are at least of suflicient height to form supporting members or bars of the grating which support the same against fieXion by any superimposed weight.

6 indicates sections or portions of the base or web 2 of said rolled bar which, in the finished grating illustrated in Figs. 3 and 4, constitute transverse connecting pieces between the longitudinal main or supporting members 1. Said transverse connecting portions are shown in the drawings as extending across between the members l at right angles thereto but obviously might connect them at any angle or be disposed in any desired relation to them to form the finished grating of any desired pattern difi'erent from the pattern illu trated in Fig. 3. v

3 indicates sections of the base 2 removed from the rolled blank to produce the openings for the grating, leaving the connecting portions 6 which, it will be obvious, are rolled connections integral with the rolled members 1. The lines of separation of the sections 3 in the rolled blank are indicated by the dotted lines 4 and 5 in the Figsif and 2. Obviously these sections 3 may be removed by any desired process as for in-' stance by a punching process and to facilitate their removal the portions of the base embracing said removed sections may be thinner than the portion embracing the connecting portions or members 6 as illustrated in Fig. 5, thus facilitating the removal of the sections 3 by the punching operation.

As will be seen the ribs projecting from one surface of the web constitute the main supports of the grating, while the wear or tread surface of the grating consists of the opposite surface of the bar and includes the portions of the web comprising the connecting portions 6 unremoved and substantially flush with the surface of the remaining portion of the rolled bar, thus providing when a bar of the particular form shown in cross-section is employed, a uniformly smooth wear or tread surface in the finished grating as shown in the plan Fig. 3 and in the section Fig. 4:.

As will be seen, in my improved grating l[ secure maximum strength owing to the fact that all the parts are of rolled metal and integral with one another and moreover the grating may be manufactured by practically two operations, one a rolling operation and the other a stamping operation, thereby permitting the same to be manufactured cheaply.

Obviously the amount of metal left in the base in the I spaces 3 between connecting members 6 may be greater or less as desired and as determined by the rolling operation. Obviously also the openings in the grating mlay, as is sometimes done, be filled in With g ass. I

What I claim as my invention is 1. 'A metal. grating consisting of asection of rolled and stamped flanged or ribbed metal bar, ribs or flanges of which projecting from one side of the bar constitute the longitudinal or supporting members of the grating, While the tread portion of the grating consists of the opposite side of said bar, the unremoved portions of the web .forming connecting members between the longitudinal supporting members.

2. A rolled metal grating consisting of a section of'rolled metal bar having one side smooth and the other side provided Withlongitudinal projecting ribs or flanges constituting" supporting members, and connecting portions between bars, consisting of unremoved parts of the Web or body, the Whole forming a grating Whose diiferent members are integral with one another while sisting in providing a section of rolled metal bar smooth upon one side or surface and provided with longitudinal ribs or flanges projecting fromits opposite side, removing portions of the body or base of the bar between ribs to provide the ventilating spaces of the grating leaving other portions intact to constitute connecting members between ribs as well as a portion of the uniform wear or tread surface.

- Signed at New York, in the county of New York and State of New York, this 24th day of March, A. D. 1919.

MAURICE LACHMAN. Witnesses:

F. B. TOWNSEND, IRENE LEFKOWITZ. 

